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THE RESPIRATORY SYSTEM:
BREATHINGHuman Bio 11
BREATHING
The movement of air into and out of the lungs.
The average adult’s respiratory rate at rest is about 15 – 20 breaths per minute.
As soon as you start thinking about breathing, your breathing patterns change.
TYPES OF BREATHING
Shallow Breathing: Only the top, narrow portion of the lung is used. When inhaling:
abdomen is pushed in diaphragm is pushed up air has nowhere to go shoulders raise to make room.
TYPES OF BREATHING
Deep Breathing: Abdominal breathing, diaphragmatic breathing,
or belly breathing Expands the lungs and forces a better distribution
of air to all sections. When inhaling:
sitting upright abdomen is pushed out diaphragm contracts (pushes downward) seems like air reaches your stomach
BREATHING
During Inhalation (Inspiration):
The diaphragm contracts. Flattens and lowers.
Intercostal muscles cause the rib cage to rise.
The volume in chest cavity is increased.
Air pressure decreases, so air rushes in to equalize the pressure in the lungs.
BREATHING
During Exhalation (Expiration):
Diaphragm relaxes.
Rib cage lowers.
Pressure inside is greater, so air moves out.
Exhalation is a passive event. All muscles relax.
BREATHING
Involuntary. Controlled by the brain. Brain notices when carbon dioxide levels are high. It sends nerve impulses to the diaphragm causing
it to contract.
Breathing can be controlled consciously as well.
RESPIRATORY RATE
The amount of breaths per minute.
Increases during exercise.
Two ways in increase oxygen intake: Breathe faster (rate). Breathe deeper (volume).
HYPERVENTILATION
Abnormally rapid, deep breathing.
Usually caused by anxiety or stress.
The release of carbon dioxide exceeds the body’s production of carbon dioxide. Too much carbon dioxide is exhaled.
HYPERVENTILATION
Causes: Blood vessels to constrict (get smaller). Decreased blood flow.
A person can become dizzy and faint.
Breathing into a paper bag and re-breathing the air may help increase the carbon dioxide content in the blood.